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Improved version of LPP with support for broadcasts as well as announcement data in the probes

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This commit is contained in:
adamdunkels 2009-02-08 19:30:18 +00:00
parent 37b86b9236
commit 085df6b630
1 changed files with 131 additions and 35 deletions
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162
core/net/mac/lpp.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: lpp.c,v 1.5 2008/06/30 08:08:59 adamdunkels Exp $
* $Id: lpp.c,v 1.6 2009/02/08 19:30:18 adamdunkels Exp $
*/
/**
@ -51,13 +51,14 @@
*/
#include "dev/leds.h"
#include "lib/random.h"
#include "net/rime.h"
#include "net/mac/mac.h"
#include "net/mac/lpp.h"
#include "net/rime/rimebuf.h"
#include <stdlib.h>
#define DEBUG 0
#if DEBUG
#include <stdio.h>
@ -67,6 +68,19 @@
#endif
struct announcement_data {
uint16_t id;
uint16_t value;
};
#define ANNOUNCEMENT_MSG_HEADERLEN 2
struct announcement_msg {
uint16_t num;
struct announcement_data data[];
};
#define LPP_PROBE_HEADERLEN 2
#define TYPE_PROBE 1
#define TYPE_DATA 2
struct lpp_hdr {
@ -79,13 +93,18 @@ static const struct radio_driver *radio;
static void (* receiver_callback)(const struct mac_driver *);
static struct pt pt;
static struct ctimer timer;
static struct timer packet_lifetime_timer;
static struct queuebuf *queued_packet;
#define LISTEN_TIME CLOCK_SECOND / 128
#define OFF_TIME CLOCK_SECOND / 4
static uint8_t is_listening = 0;
#define LISTEN_TIME CLOCK_SECOND / 64
#define OFF_TIME CLOCK_SECOND * 1
#define PACKET_LIFETIME LISTEN_TIME + OFF_TIME
#define DUMP_QUEUED_PACKET 0
#define DUMP_QUEUED_PACKET 1
/*---------------------------------------------------------------------------*/
static void
@ -102,6 +121,20 @@ turn_radio_off(void)
leds_off(LEDS_YELLOW);
}
/*---------------------------------------------------------------------------*/
static void
remove_queued_packet(void)
{
queuebuf_free(queued_packet);
queued_packet = NULL;
}
/*---------------------------------------------------------------------------*/
static void
listen_callback(int periods)
{
is_listening = periods;
turn_radio_on();
}
/*---------------------------------------------------------------------------*/
/**
* Send a probe packet.
*/
@ -109,15 +142,33 @@ static void
send_probe(void)
{
struct lpp_hdr *hdr;
struct announcement_msg *adata;
struct announcement *a;
/* Set up the probe header. */
rimebuf_clear();
hdr = rimebuf_dataptr();
rimebuf_set_datalen(sizeof(struct lpp_hdr));
hdr = rimebuf_dataptr();
hdr->type = TYPE_PROBE;
rimeaddr_copy(&hdr->sender, &rimeaddr_node_addr);
rimeaddr_copy(&hdr->receiver, rimebuf_addr(RIMEBUF_ADDR_RECEIVER));
hdr->type = TYPE_PROBE;
PRINTF("Sending probe\n");
/* Construct the announcements */
adata = (struct announcement_msg *)((char *)hdr + sizeof(struct lpp_hdr));
adata->num = 0;
for(a = announcement_list(); a != NULL; a = a->next) {
adata->data[adata->num].id = a->id;
adata->data[adata->num].value = a->value;
adata->num++;
}
rimebuf_set_datalen(sizeof(struct lpp_hdr) +
ANNOUNCEMENT_MSG_HEADERLEN +
sizeof(struct announcement_data) * adata->num);
/* PRINTF("Sending probe\n");*/
radio->send(rimebuf_hdrptr(), rimebuf_totlen());
}
/*---------------------------------------------------------------------------*/
@ -133,28 +184,34 @@ dutycycle(void *ptr)
PT_BEGIN(&pt);
while(1) {
if(queued_packet != NULL) {
/* We are currently sending a packet so we should keep the radio
turned on and not send any probes at this point. */
ctimer_set(t, OFF_TIME * 2, (void (*)(void *))dutycycle, t);
PT_YIELD(&pt);
queuebuf_free(queued_packet);
queued_packet = NULL;
PRINTF("Removing old packet\n");
}
turn_radio_on();
send_probe();
ctimer_set(t, LISTEN_TIME, (void (*)(void *))dutycycle, t);
PT_YIELD(&pt);
turn_radio_off();
/* There is a bit of randomness here right now to avoid collisions
due to synchronization effects. Not sure how needed it is
though. XXX */
ctimer_set(t, OFF_TIME / 2 + (random_rand() % OFF_TIME / 2),
(void (*)(void *))dutycycle, t);
PT_YIELD(&pt);
if(queued_packet == NULL) {
if(is_listening == 0) {
turn_radio_off();
/* There is a bit of randomness here right now to avoid collisions
due to synchronization effects. Not sure how needed it is
though. XXX */
ctimer_set(t, OFF_TIME / 2 + (rand() % (OFF_TIME / 2)),
(void (*)(void *))dutycycle, t);
PT_YIELD(&pt);
} else {
is_listening--;
ctimer_set(t, OFF_TIME,
(void (*)(void *))dutycycle, t);
PT_YIELD(&pt);
}
} else {
/* We are currently sending a packet so we should keep the radio
turned on and not send any probes at this point. */
ctimer_set(t, PACKET_LIFETIME, (void (*)(void *))dutycycle, t);
PT_YIELD(&pt);
remove_queued_packet();
PRINTF("Removing old packet\n");
}
}
PT_END(&pt);
@ -187,7 +244,10 @@ send_packet(void)
hdr->type = TYPE_DATA;
rimebuf_compact();
PRINTF("queueing packet type %d\n", hdr->type);
PRINTF("%d.%d: queueing packet to %d.%d, channel %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
hdr->receiver.u8[0], hdr->receiver.u8[1],
rimebuf_attr(RIMEBUF_ATTR_CHANNEL));
if(rimebuf_attr(RIMEBUF_ATTR_PACKET_TYPE) == RIMEBUF_ATTR_PACKET_TYPE_ACK) {
/* Immediately send ACKs - we're assuming that the other node is
@ -202,7 +262,7 @@ send_packet(void)
measured the effect of this option */
#if DUMP_QUEUED_PACKET
if(queued_packet != NULL) {
queuebuf_free(queued_packet);
remove_queued_packet();
}
queued_packet = queuebuf_new_from_rimebuf();
#else /* DUMP_QUEUED_PACKET */
@ -211,6 +271,7 @@ send_packet(void)
}
#endif /* DUMP_QUEUED_PACKET */
timer_set(&packet_lifetime_timer, PACKET_LIFETIME);
/* Wait for a probe packet from a neighbor */
turn_radio_on();
}
@ -235,20 +296,52 @@ read_packet(void)
rimebuf_set_datalen(len);
hdr = rimebuf_dataptr();
rimebuf_hdrreduce(sizeof(struct lpp_hdr));
PRINTF("got packet type %d\n", hdr->type);
/* PRINTF("got packet type %d\n", hdr->type);*/
if(hdr->type == TYPE_PROBE) {
/* Parse incoming announcements */
struct announcement_msg *adata = rimebuf_dataptr();
int i;
/* PRINTF("%d.%d: probe from %d.%d with %d announcements\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
hdr->sender.u8[0], hdr->sender.u8[1], adata->num);*/
for(i = 0; i < adata->num; ++i) {
/* PRINTF("%d.%d: announcement %d: %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
adata->data[i].id,
adata->data[i].value);*/
announcement_heard(&hdr->sender,
adata->data[i].id,
adata->data[i].value);
}
/* Check if the outbound packet has been waiting too long in the
queue. If so, we remove the packet from the queue. */
if(queued_packet != NULL && timer_expired(&packet_lifetime_timer)) {
remove_queued_packet();
}
if(queued_packet != NULL) {
qhdr = queuebuf_dataptr(queued_packet);
if(rimeaddr_cmp(&qhdr->receiver, &hdr->sender) ||
rimeaddr_cmp(&qhdr->receiver, &rimeaddr_null)) {
PRINTF("%d.%d: got a probe from %d.%d\n",
PRINTF("%d.%d: got a probe from %d.%d, sending packet to %d.%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
hdr->sender.u8[0], hdr->sender.u8[1]);
hdr->sender.u8[0], hdr->sender.u8[1],
qhdr->receiver.u8[0], qhdr->receiver.u8[1]);
radio->send(queuebuf_dataptr(queued_packet),
queuebuf_datalen(queued_packet));
queuebuf_free(queued_packet);
queued_packet = NULL;
/* If the packet was not a broadcast packet, we dequeue it
now. Broadcast packets should be transmitted to all
neighbors, and are dequeued by the dutycycling function
instead, after the appropriate time. */
if(!rimeaddr_cmp(&qhdr->receiver, &rimeaddr_null)) {
remove_queued_packet();
}
turn_radio_on(); /* XXX Awaiting an ACK: we should check the
packet type of the queued packet to see
@ -313,6 +406,9 @@ lpp_init(const struct radio_driver *d)
radio = d;
radio->set_receive_function(input_packet);
ctimer_set(&timer, LISTEN_TIME, (void (*)(void *))dutycycle, &timer);
announcement_register_listen_callback(listen_callback);
return &lpp_driver;
}
/*---------------------------------------------------------------------------*/